Dokuwiki Reader fix: parse single curly brace (#5417)

fixes #5416

src/Text/Pandoc/Readers/DokuWiki.hs

@@ -358,7 +358,7 @@ parseWidthHeight s = (width, height)
         _ -> Nothing
 
 image :: PandocMonad m => DWParser m B.Inlines
-image = parseLink fromRaw "{{" "}}"
+image = try $ parseLink fromRaw "{{" "}}"
   where
     fromRaw path description =
       if linkOnly

test/command/5416.md

@@ -0,0 +1,11 @@
+```
+% echo "{" | pandoc -f dokuwiki -t native
+^D
+[Para [Str "{"]]
+```
+
+```
+% echo "{{" | pandoc -f dokuwiki -t native
+^D
+[Para [Str "{{"]]
+```